Saudi authorities suspended all operations at King Khalid International Airport in Riyadh after an attack killed at least 12 people, including a US citizen. Saudi-led coalition vows retaliation, and US President Trump said the US may join strikes against the Houthis. Flights and cargo routes through the Gulf may be disrupted, and oil prices could move. Thai businesses that import through the Middle East, export to Saudi, or rely on fuel costs should check exposure and watch for travel advisories and route changes.